looks like the cache flag requires a lock file?

lets try without

Author: themasch

.github/workflows/test.yml

@@ -21,10 +21,9 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v2
+    - uses: actions/setup-node@v2
       with:
-        node-version: ${{ matrix.node-version }}
-        cache: 'npm'
+        node-version: ${{ matrix.node }}
+    - run: npm install
     - run: npm ci
     - run: npm test